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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1709 (HVAC Systems - Troubleshooting) >> Repair Instructions >> Thermal Expansion Valve Replacement - Auxiliary >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the evaporator core-auxiliary. Refer to Evaporator Core Replacement - Auxiliary .
    2. Fig 1: Auxiliary Thermal Expansion Valve
    GM814589Courtesy of GENERAL MOTORS CORP.
  2. Remove the foam insulators (3) from the evaporator core-auxiliary lines.
  3. Remove the foam insulators from the thermal expansion valve-auxiliary (4).
  4. Using a back up wrench loosen the flare nuts from the thermal expansion valve-auxiliary.
  5. Remove the auxiliary thermal expansion valve sensing bulb and retaining clip from the evaporator core-auxiliary lines.
  6. Remove the thermal expansion valve-auxiliary from the evaporator core-auxiliary.
    7. IMPORTANT: Cap or tape the open A/C refrigerant lines immediately.
  7. Remove and discard the O-ring seals from the evaporator core-auxiliary. Cap or tape the lines to prevent contamination of the evaporator core-auxiliary.
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